Relay.



P. L. DODGSON.

RELAY.

APPLICATION EILEE NOV. s, 1906. RENEWED JUNE 6, 1906.

920,036, Patented Apr. 27, 1909.

2 SHEETS-SHEET 1.

I 1 F/ i W/r/vEssEa.

vauhwgrrizz;

/- VEN TO 1-? ATT'YI3.

P. L. DODGSON.

RELAY. APPLICATION FILED NOV. 3, 190a. RENEWED JUNE 6, 190B.

Patented Apr; 27, 1909.

2 BHEETS*SHEET 2.

null

7 H H H u //v VEN 70/? v Iva-N15555:.

rnrns Parent l ltdh'h l.. IHHHESUN, OF BUFFALO, NEW YORK.

Specification of Letters Patent.

Patented April 2'7, 1908.

Original acvlication filed may 17, 1906, Serial No. 317,269. Divided andthis application filed November 3, 1906,

Serial No. M1358.

a New York, have invented a new and useful lug-1s a speciiiczrtion.

My invention relates to. relays and more particularly to relays ol thepolarized type employed in railway switching andsig'lniling Tmprovementin Relays, of which the followsystems.

The object of my invention is to provide a polariaed relay in whichcertainty of action is insured and iii Which'the h s of magnetic energyis reduced to the minimum.

Afurther object is to embody ina polarized relay the improvements of mylatent No. $96,809, Aug. 25, 1908, of-which this is .a divisionalapplication.

Referring to the drawings herewith, Figure 1 is a side elevation, partlyin section on the axis of one of the magnet coils. Fig. 2 a horizontalsection on the line i -.7; of Fig. 1. Fig. 3 is a side elevation of oneof my permanent magnets, my swinging contact arm and contacts. Fig. 4-is an end elevation of the contact arm and contacts.

I will first describe the relay proper. in the drawings 1 have shown atwo-arm, l'ourcoiitact relay. Thehousing of the apparatus is madenp of abase-plate 1, a carry plate 2, and a surrounding glass or othernon-conducting body 3. The .eripheries of the body 3 are seated Within langcs on the plates 1 and 2;, gether by screws 4. proof cement thehousing ailords a damppro'of chamber for the working parts of the relay.The magnet cores are made up of cylindrical bodies 5 and rectangularshaped and enlarged ends 6 and 7. The bodies 5 ol' the cores fit snuglythrough holes in the. carrying-plate 2 and are secured to it by screws6, 7 (see Fig. 2) passing through said plate and threaded into therectangular ends 6 and 7 on two diametrically op osite corners. Thewindings 8'and the siells 9 are slipped over the cores 5 and held downfirmly by the binding-post 10, which, in turn, is

held down by' nuts 1-1 threaded to the upper ends of the cores 5.

binding-posts for the circuit of the magnets.

12 is an armature common to both mag The yoke 10 carries the RenewedJune 5, 1908. Serial No. 37,199.

and the parts are. held to- The plate 2, and faces the rectangular ends6 and 7 of the cores. Mounted with but insulated from the armature 12arefcontact arms 14, which. alien the-magnets are denergized makeelectrical connection with the back contacts 15 v\ hich are electricallyconnected with the'hin ii. the energized state of the magnets, makeelectrical connection with the contacts 16, which are electricallyconnected with the binding -posts '18 and The inleading -\ures connectwith the binding-posts l7 and 20, which are connected with theirrespective contact ai is llhy llcrihle conductors 18.

Having thus indicated the parts and general construction of the relayproper, I will now describe the features of my invention.Pivotallymounted between the poles 6 and 7 is a non-magnetic arn 27. Thepivots on this arm are carried by a lug on the plate 2, shown in hrohenoutline in Fig. 1 and by a plate the plate 2. The arm 27 has thus alimited motion in. rotation in a horizontal plane. Rigidly secured tothis plate 27 are per-. manent magnets :38 and 29. These magnetsztltll0]SC*SllUtESlltlPQd, or, perhaps more prop only rectangular inform, the inner rectangular area beipgslightly in excess of therrossscction oi the pole pieces 6 and 7 to permit of sullicient swing ofthe arm 27 ding-posts] 9 and 22 and which,

36 which is secured to lugs on At one end of the arm is secured an invpiece 31 32 and 34 insulated from sulating piece 31 and secured to thisare contact brushes 23 and 24 are contacts connecting with binding postson the carrying -plate 2. so contacts 23 and 24 and the contact brushes32 and 34 are so positioned that when the arm 27 is swung in onedirection the brush 32 will make electrical connection with the contact23. and the brush 34 will make electrical connection with the contact24; and when the arm 27 is swung in other direction the brush 32 Willmake electrical connection with the contact 24 and the brush 34 Withthecontact 23. From a binding post 25 a flexible conductor 33 connects withthe contact brush 32, and from a bind ing-post 26 a flexible conductor35 connects- With the contact brush 34.

The most important feature of my invention 1s the means whereby I ellectthe movement ofdghe arm 27. The permanent magnets are so arranged asregards their polarity tion.

that like poles of both magnets are oii't e" same side of the polepiecesof the electro righthand leg of the permanent ma net 28" would thereforebe attracted toward t e pole piece 6, and likewise the left hand leg ofper- -manent magnet 29 would be attracted toward ole piece 7, andfurther,the left hand leg of permanent magnet 28 would be' repellet!from pole-piecefi' and the right; hand eg of magnet 29 would be repelledfrom pole piece 7. The whole tendency therefore of.

the magnetic effect is to rotate the two permanent magnets in a counterclockwise direc- If now the current in the electro-magnet is reversed sothat pole piece 6 becomes a positive polarity and pole piece 7 negativepolarity, the direction of all four poles of the permanent magnets wouldbe reversed and the tendency would be to rotate in the clockwisedirection. Of course every energi'zation of the magnets, whicheverdirection of flow may occur in the coils '8, will lift the armature 12and establish the circuit of the front contacts through the bindingposts 18 and 21. By this method of construction and arrangement of thepermanent magnets about the magnet poles, leakage and loss of mag--netic energy-An previous construction a serious difiiculty-ispractically eliminated. Moreover, I hereby attain in a polarized relaythe same advantages of construction which exist in my relay, abovereferred to, namely: symmetrical arrangement, in-

creasedmagrietic efficiency, and su porting all of the working parts ona single p ate and housing the same and at the same time permitting ofremoval and replacement of the magnet coils without disturbance of'theadjustment of the working parts.

Having thus described my invention, what I claim is: v

1; In combination with the electro-magnet, armature, contact arms andcontacts of a relay, a neutral armature, two permanent magnets carriedby said neutral armature,

pivots carrying said neutral armature and permanent magnets so that saidpermanent I magnets swing in a plane at right angles to the cores of theelectro-magnet, said permaolarity so arnent magnets having their rangedthat the magnetic e 'ect of all four poles tends to rotate them in thesame direction.

2. In a relay, in combination with the electro-magnet, pole pieces, anarmature governed by said magnet, a pole changing arm and contacts andermanent magnets surrounding the three si es of said pole pieces andarranged'as to their polarity so that the magnetic effect 'of all fourpoles tends to rotatc themin the same direction.

3. In a relay in combination with the electro-magnet, poleieces,armature and contacts for establis 'ng a circuit or circuits,

means for determining the direction of current flow in a circuit,comprising a polechanger, an arm governing the same, permanent magnetssecured to said arm and in the magnetic field of said pole pieces onthree sides of said pole pieces and so arranged as to their fixedpolarity, that when ever current is sent through the magnet of saidrelay said armature is moved to establish a circuit or circuits andwhereby said pole-changer is moved to establish direction of flow in acircuit in accordance with the direction of flow of current in saidelectro-magnet. v

4. In a relay, in combination with the ,electro-magnet, armature andcontacts for establishing a circuit,-means for changing the direction ofcurrent flow in a circuit in accordance with the direction of currentflow in the relay coils comprising contacts, a pivoted arm and permanentmagnets secured to said arm, said permanent magnets lying in themagnetic field of the poles of the relay magnet and upon three sides ofthe same and arranged so that the magnetic ifect of all four polestendsto rotate them in the same direction.

In testimony whereof, I have-hereunto set my hand in the presence-0f twowitnesses.

FRANK DODGSON. 1 Witnesses A. F. Dinrnroir, O. 'L. Yneen.

